Not at all! As you said, that refers specifically to slavery, prostitution, or other forms of dealing in flesh. Psychology can be very helpful if done in a compassionate and responsible way, so I would say that there is absolutely no problem so long as the experiment is not designed to hurt anyone or to cause suffering.

Gain and loss, status and disgrace, censure and praise, pleasure and pain:these conditions among human beings are inconstant,impermanent, subject to change.

ccharles wrote:Would participation in psychology studies fall within "business in human beings"? Or is this referring to something more like prostitution, slavery, etc?

If you are in doubt, share the type of study. *Study* is such a vague term, it could be anything.

Like, there once was a study done, how much pain someone would inflict upon another, if s-he was TOLD to increase the electrical current on a scale, applied to another human being.

The result was, that a lot of people went way too far, although the "victims" showed lots of pain. when they were told to increase the current, as if they weren't responsible anymore and some might have gone into the area that read:

"possibly lethal dose", if they had been told they have to...

some refused to go further if the victim showed pain.

I personally would refuse to do this type of psychological experiment.